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1 The number of octagon diagonals is 20. 2  The sum of all interior angle = 1080 degrees. 3  Since the sides for an regular octagon are equal, the interior angle at each vertex is = $\frac{1080}{8}$ = 135 degrees. 4  The total exterior angle is 360 degrees.
The general formula for finding the number of triangles that can be formed is n-2, where ânâ is the number of sides of the polygon. The sum of the interior angles of a decagon is 1440 degrees, and the exterior angle of a decagon is 36 degrees. The interior angle of a decagon is 144 degrees.